pH Buffer Calibration Solution Kit 4-Pack — 250 mL (8.4 fl oz) Each: pH 4.00 Buffer, pH 7.00 Buffer, pH 10.00 Buffer, and Electrode Storage Solution — NIST Traceable Reference Standards;

These buffer calibration solutions are suitable for the calibration of all pH meters. Each production lot is manufactured following carefully controlled written procedures and standardized against NIST standard reference materials (SRM) for highest accuracy. The finished product is assigned a unique Lot number and expiration date. These products will have greater than one year shelf life when received. The electrode storage solution will help keep the pH electrode clean and protected.